Functional characterization of nicotinic receptors in amacrine cells of rat retina
- Autores
- Gumilar, Fernanda Andrea; Politi, Luis Enrique; Bouzat, Cecilia Beatriz
- Año de publicación
- 2008
- Idioma
- inglés
- Tipo de recurso
- documento de conferencia
- Estado
- versión publicada
- Descripción
- Amacrine cells are a heterogeneous class of interneurons that modulate the transfer of the light signals through the retina. The cholinergic system present in these neurons is involved in such modulation. However, the characterization of nicotinic cholinergic receptors (AChRs) in amacrine cells and their possible roles during the retina development remain unknown. In this study, we have identified functional AChRs in amacrine cells and determined their effects on neurite outgrowth using amacrineenriched cultures obtained from rat retinae. Amacrine cells were identified by their morphology and by immunocytochemical techniques using the monoclonal antibody HPC-1. We measured function of AChRs by electrophysiological studies and by confocal microscopy combined with the Ca2-+-sensitive fluorescent indicator Fluo-3/AM. Our results show that a7 AChRs are present in amacrine cells. The level of expression, measured by rhodamine-labelled a-bungarotoxin, increases in a time-dependent manner during culture. Maximal expression levels are achieved at days 8-9. Amacrine cells were examined with whole-cell recording techniques. Two different types of responses to ACh are observed after day 8 in culture: a slow-decay current (td = 111 +15 ms), and a fast-decay current (td = 11 = 2 ms). The latter one probably corresponds to functional a7 AChR, since this receptor shows fast desensitization and since the currents are inhibited by the specific antagonist, a-bungarotoxin. Given that a7 is highly permeable to calcium ions, we also assessed [Ca2+]i oscillations with Fluo3-AM induced by nicotinic agonists. When cells are exposed to ACh or nicotine, Ca2+ influx is detected as an increase in the fluorescence intensity. a-Bgt inhibits this signal, again indicating functional a7 AChRs. Interestingly, the presence of nicotine significant increases neuritic length of cultured amacrine cells. This outgrowth effect is abolished by co-treatment with a-B gt. In conclusion, amacrine cells have functional o7 receptors which may have a role in retinal synaptogenesis
Fil: Gumilar, Fernanda Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Fil: Politi, Luis Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Fil: Bouzat, Cecilia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina
Sociedad Argentina de Investigación en Neurociencias. Workshop Neuronal Communication: From structure to physiology
Bahía Blanca
Argentina
Sociedad Argentina de Investigación en Neurociéncias - Materia
-
NICOTINIC RECEPTORS
AMACRINE CELLS
RETINA - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/242911
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Functional characterization of nicotinic receptors in amacrine cells of rat retinaGumilar, Fernanda AndreaPoliti, Luis EnriqueBouzat, Cecilia BeatrizNICOTINIC RECEPTORSAMACRINE CELLSRETINAhttps://purl.org/becyt/ford/3.1https://purl.org/becyt/ford/3Amacrine cells are a heterogeneous class of interneurons that modulate the transfer of the light signals through the retina. The cholinergic system present in these neurons is involved in such modulation. However, the characterization of nicotinic cholinergic receptors (AChRs) in amacrine cells and their possible roles during the retina development remain unknown. In this study, we have identified functional AChRs in amacrine cells and determined their effects on neurite outgrowth using amacrineenriched cultures obtained from rat retinae. Amacrine cells were identified by their morphology and by immunocytochemical techniques using the monoclonal antibody HPC-1. We measured function of AChRs by electrophysiological studies and by confocal microscopy combined with the Ca2-+-sensitive fluorescent indicator Fluo-3/AM. Our results show that a7 AChRs are present in amacrine cells. The level of expression, measured by rhodamine-labelled a-bungarotoxin, increases in a time-dependent manner during culture. Maximal expression levels are achieved at days 8-9. Amacrine cells were examined with whole-cell recording techniques. Two different types of responses to ACh are observed after day 8 in culture: a slow-decay current (td = 111 +15 ms), and a fast-decay current (td = 11 = 2 ms). The latter one probably corresponds to functional a7 AChR, since this receptor shows fast desensitization and since the currents are inhibited by the specific antagonist, a-bungarotoxin. Given that a7 is highly permeable to calcium ions, we also assessed [Ca2+]i oscillations with Fluo3-AM induced by nicotinic agonists. When cells are exposed to ACh or nicotine, Ca2+ influx is detected as an increase in the fluorescence intensity. a-Bgt inhibits this signal, again indicating functional a7 AChRs. Interestingly, the presence of nicotine significant increases neuritic length of cultured amacrine cells. This outgrowth effect is abolished by co-treatment with a-B gt. In conclusion, amacrine cells have functional o7 receptors which may have a role in retinal synaptogenesisFil: Gumilar, Fernanda Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Politi, Luis Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaFil: Bouzat, Cecilia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; ArgentinaSociedad Argentina de Investigación en Neurociencias. Workshop Neuronal Communication: From structure to physiologyBahía BlancaArgentinaSociedad Argentina de Investigación en NeurociénciasSociedad Argentina de Investigación en Neurociencias2008info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectWorkshopBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/242911Functional characterization of nicotinic receptors in amacrine cells of rat retina; Sociedad Argentina de Investigación en Neurociencias. Workshop Neuronal Communication: From structure to physiology; Bahía Blanca; Argentina; 2008; 34-34CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://saneurociencias.org.arNacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:43:48Zoai:ri.conicet.gov.ar:11336/242911instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:43:48.909CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
title |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
spellingShingle |
Functional characterization of nicotinic receptors in amacrine cells of rat retina Gumilar, Fernanda Andrea NICOTINIC RECEPTORS AMACRINE CELLS RETINA |
title_short |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
title_full |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
title_fullStr |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
title_full_unstemmed |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
title_sort |
Functional characterization of nicotinic receptors in amacrine cells of rat retina |
dc.creator.none.fl_str_mv |
Gumilar, Fernanda Andrea Politi, Luis Enrique Bouzat, Cecilia Beatriz |
author |
Gumilar, Fernanda Andrea |
author_facet |
Gumilar, Fernanda Andrea Politi, Luis Enrique Bouzat, Cecilia Beatriz |
author_role |
author |
author2 |
Politi, Luis Enrique Bouzat, Cecilia Beatriz |
author2_role |
author author |
dc.subject.none.fl_str_mv |
NICOTINIC RECEPTORS AMACRINE CELLS RETINA |
topic |
NICOTINIC RECEPTORS AMACRINE CELLS RETINA |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/3.1 https://purl.org/becyt/ford/3 |
dc.description.none.fl_txt_mv |
Amacrine cells are a heterogeneous class of interneurons that modulate the transfer of the light signals through the retina. The cholinergic system present in these neurons is involved in such modulation. However, the characterization of nicotinic cholinergic receptors (AChRs) in amacrine cells and their possible roles during the retina development remain unknown. In this study, we have identified functional AChRs in amacrine cells and determined their effects on neurite outgrowth using amacrineenriched cultures obtained from rat retinae. Amacrine cells were identified by their morphology and by immunocytochemical techniques using the monoclonal antibody HPC-1. We measured function of AChRs by electrophysiological studies and by confocal microscopy combined with the Ca2-+-sensitive fluorescent indicator Fluo-3/AM. Our results show that a7 AChRs are present in amacrine cells. The level of expression, measured by rhodamine-labelled a-bungarotoxin, increases in a time-dependent manner during culture. Maximal expression levels are achieved at days 8-9. Amacrine cells were examined with whole-cell recording techniques. Two different types of responses to ACh are observed after day 8 in culture: a slow-decay current (td = 111 +15 ms), and a fast-decay current (td = 11 = 2 ms). The latter one probably corresponds to functional a7 AChR, since this receptor shows fast desensitization and since the currents are inhibited by the specific antagonist, a-bungarotoxin. Given that a7 is highly permeable to calcium ions, we also assessed [Ca2+]i oscillations with Fluo3-AM induced by nicotinic agonists. When cells are exposed to ACh or nicotine, Ca2+ influx is detected as an increase in the fluorescence intensity. a-Bgt inhibits this signal, again indicating functional a7 AChRs. Interestingly, the presence of nicotine significant increases neuritic length of cultured amacrine cells. This outgrowth effect is abolished by co-treatment with a-B gt. In conclusion, amacrine cells have functional o7 receptors which may have a role in retinal synaptogenesis Fil: Gumilar, Fernanda Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Fil: Politi, Luis Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Fil: Bouzat, Cecilia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones Bioquímicas de Bahía Blanca. Universidad Nacional del Sur. Instituto de Investigaciones Bioquímicas de Bahía Blanca; Argentina Sociedad Argentina de Investigación en Neurociencias. Workshop Neuronal Communication: From structure to physiology Bahía Blanca Argentina Sociedad Argentina de Investigación en Neurociéncias |
description |
Amacrine cells are a heterogeneous class of interneurons that modulate the transfer of the light signals through the retina. The cholinergic system present in these neurons is involved in such modulation. However, the characterization of nicotinic cholinergic receptors (AChRs) in amacrine cells and their possible roles during the retina development remain unknown. In this study, we have identified functional AChRs in amacrine cells and determined their effects on neurite outgrowth using amacrineenriched cultures obtained from rat retinae. Amacrine cells were identified by their morphology and by immunocytochemical techniques using the monoclonal antibody HPC-1. We measured function of AChRs by electrophysiological studies and by confocal microscopy combined with the Ca2-+-sensitive fluorescent indicator Fluo-3/AM. Our results show that a7 AChRs are present in amacrine cells. The level of expression, measured by rhodamine-labelled a-bungarotoxin, increases in a time-dependent manner during culture. Maximal expression levels are achieved at days 8-9. Amacrine cells were examined with whole-cell recording techniques. Two different types of responses to ACh are observed after day 8 in culture: a slow-decay current (td = 111 +15 ms), and a fast-decay current (td = 11 = 2 ms). The latter one probably corresponds to functional a7 AChR, since this receptor shows fast desensitization and since the currents are inhibited by the specific antagonist, a-bungarotoxin. Given that a7 is highly permeable to calcium ions, we also assessed [Ca2+]i oscillations with Fluo3-AM induced by nicotinic agonists. When cells are exposed to ACh or nicotine, Ca2+ influx is detected as an increase in the fluorescence intensity. a-Bgt inhibits this signal, again indicating functional a7 AChRs. Interestingly, the presence of nicotine significant increases neuritic length of cultured amacrine cells. This outgrowth effect is abolished by co-treatment with a-B gt. In conclusion, amacrine cells have functional o7 receptors which may have a role in retinal synaptogenesis |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/conferenceObject Workshop Book http://purl.org/coar/resource_type/c_5794 info:ar-repo/semantics/documentoDeConferencia |
status_str |
publishedVersion |
format |
conferenceObject |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/242911 Functional characterization of nicotinic receptors in amacrine cells of rat retina; Sociedad Argentina de Investigación en Neurociencias. Workshop Neuronal Communication: From structure to physiology; Bahía Blanca; Argentina; 2008; 34-34 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/242911 |
identifier_str_mv |
Functional characterization of nicotinic receptors in amacrine cells of rat retina; Sociedad Argentina de Investigación en Neurociencias. Workshop Neuronal Communication: From structure to physiology; Bahía Blanca; Argentina; 2008; 34-34 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://saneurociencias.org.ar |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.coverage.none.fl_str_mv |
Nacional |
dc.publisher.none.fl_str_mv |
Sociedad Argentina de Investigación en Neurociencias |
publisher.none.fl_str_mv |
Sociedad Argentina de Investigación en Neurociencias |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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